Ultimate Hardness Examples of material ISO group WMG (Work Material Group) (HB or HRC) Tensile Strength (AISI, EN, DIN, SS, STN, BS, UNE, CN, AFNOR, GOST, UNI...) (MPa) AISI 1108, EN 15S22, DIN 1.0723, SS 1922, ČSN 11120, BS 210A15, UNE F.210F, GB Y15, AFNOR 10F1, GOST A30, P1.1 sulfurized < 240 HB ≤ 830 UNI CF10S20 Free machining steel AISI 1211, EN 11SMn30, DIN 1.0715, SS 1912, ČSN 11109, BS 230M7, UNE F.2111, GB Y15, AFNOR S250, GOST A40G, P1 P1.2 (carbon steels with increased machinability) sulfurized and phosphorized < 180 HB ≤ 620 UNI CF9SMn28 sulfurized/phosphorized AISI 12L13, EN 11SMnPb30, DIN 1.0718, SS 1914, ČSN 12110, BS 210M16, UNE F.2114, GB Y15Pb, AFNOR S250Pb, P1.3 < 180 HB ≤ 620 and leaded GOST AS35G2, UNI CF10SPb20 P2.1 containing <0.25%C < 180 HB ≤ 620 AISI 1015, EN C15, DIN 1.0401, SS 1350, ČSN 11301 , BS 080A15, UNE F.111, GB 15, AFNOR C18RR, GOST St2ps, UNI Fe360 Plain carbon steel AISI 1030, EN C30, DIN 1.0528, SS 1550, ČSN 12031, BS 080M32, UNE F.1130, GB 30, AFNOR AF50C30, GOST 30G, P2 P2.2 (steels comprised of mainly iron and carbon) containing <0.55%C < 240 HB ≤ 830 UNI Fe590 P2.3 containing >0.55%C < 300 HB ≤ 1030 AISI 1060, EN C60, DIN 1.0601, SS 1655, ČSN 12061, BS 080A62, UNE F513, GB 60, AFNOR 1C60, GOST 60G, UNI C60 P P3.1 annealed < 180 HB ≤ 620 AISI 5015, EN 16Mo3, DIN 1.5415, SS 2912, ČSN 15020, BS 1501-240, UNE F.2601, GB 16Mo, AFNOR 15D3, GOST 15M, UNI 16Mo3KW Alloy steel AISI 4140, EN 42CrMo4, DIN 1.7225, SS 2244, ČSN 15142, BS 708M40, UNE F.8232, GB 42CrMo, AFNOR 42CD4, P3 P3.2 (carbon steels with an alloying content ≤ 10%) hardened and tempered 180 - 260 HB > 620 ≤ 900 GOST 40ChFA, UNI 42CrMo4 AISI 4140, EN 42CrMo4, DIN 1.7225, SS 2244, ČSN 15142, BS 708M40, UNE F.8232, GB 42CrMo, AFNOR 42CD4, P3.3 260 - 360 HB > 900 ≤ 1240 GOST 40ChFA, UNI 42CrMo4 AISI D2, EN X155CrVMo12-1, DIN 1.2370, SS 2736, ČSN 19573, BS BD2, UNE F.520A, GB Cr12Mo1V1, AFNOR Z160CDV12, P4.1 annealed < 26 HRC ≤ 900 GOST Ch12MF, UNI X155CrVMo121KU Tool steel AISI D2, EN X155CrVMo12-1, DIN 1.2370, SS 2736, ČSN 19573, BS BD2, UNE F.520A, GB Cr12Mo1V1, AFNOR Z160CDV12, P4 P4.2 (special alloy steel for tools, dies and molds) hardened and tempered 26 - 39 HRC > 900 ≤ 1240 GOST Ch12MF, UNI X155CrVMo121KU AISI D2, EN X155CrVMo12-1, DIN 1.2370, SS 2736, ČSN 19573, BS BD2, UNE F.520A, GB Cr12Mo1V1, AFNOR Z160CDV12, P4.3 39 - 45 HRC > 1240 ≤ 1450 GOST Ch12MF, UNI X155CrVMo121KU M1.1 < 160 HB ≤ 520 AISI S429, EN X7Cr14, DIN 1.4001, SS 2326, BS 434S17, UNE F.3401, AFNOR Z8C12, GOST 08Ch13, UNI X6CrTi12 Ferritic stainless steel M1 M1.2 (straight chromium non-hardenable alloys) 160 - 220 HB > 520 ≤ 700 AISI 446, EN X10CrAl24, DIN 1.4762, SS 2322, ČSN 17113, BS 430S17, UNE F.3154, GB 10Cr17, AFNOR Z10CAS24, GOST 12Ch17, UNI X16Cr26 M2.1 annealed < 200 HB ≤ 670 AISI 430F, EN X14CrMoS17, DIN 1.4104, SS 2383, ČSN 17140, BS 410S21, UNE F.3117, AFNOR Z10CF17, UNI X10CrS17 Martensitic stainless steel AISI 440C, EN X105CrMo17, DIN 1.4125, SS 2385, ČSN 17023, BS 425C11, UNE F.3402; GB 102Cr17Mo, AFNOR Z100CD17, M2 M2.2 (straight chromium hardenable alloys) quenched and tempered 200 - 280 HB > 670 ≤ 950 GOST 95Ch18, UNI GX6CrNi 13 04 M2.3 precipitation-hardened 280 - 380 HB > 950 ≤ 1300 AISI 420, EN X45Cr13, DIN 1.4034, ČSN 17029, BS 425C11, UNE F.3405, AFNOR Z44C14, GOST 20X17H12, UNI X30Cr13 M M3.1 Austenitic stainless steel < 200 HB ≤ 750 AISI 308, EN X5CrNi18-12, DIN 1.4303, SS 2352, ČSN 17249, BS 305S17, UNE F.3513, GB 10Cr18Ni12, AFNOR Z8CN18.12, UNI X7CrNi18 10 M3 M3.2 (chromium-nickel and chromium-nickel-manganese alloys) 200 - 260 HB > 750 ≤ 870 AISI 309, EN X15CrNiSi20-12, DIN 1.4828, ČSN 17251, BS 309S24, UNE F.3312, GB 1Cr23Ni13, AFNOR Z15CNS20.12, GOST 20Ch20N14S2, UNI 16CrNi23 14 M3.3 260 - 300 HB > 870 ≤ 1040 AISI 5848, EN X45CrNiW18-9, DIN 1.4873, BS 331S40, UNE F.3211, AFNOR Z35CNWS14-4, UNI X45CrNiW 18 9 AISI 329, EN X1-NiCrMoCU25-20-5, DIN 1.4539, SS 2562, ČSN 17265, BS 318S13, UNE F.3552, GB 022Cr25NiMo2N, M4.1 Austenitic-ferritic (DUPLEX) or super-austenitic stainless steel < 300 HB ≤ 990 AFNOR Z1NCDU25.20 M4 AISI 631 (17-7PH), EN X7CrNiAL17-7, DIN 1.4568, SS 2388, ČSN 17465 , BS 301S13, UNE F.3217, GB 07Cr17Ni7Al, M4.2 Precipitation hardening austenitic stainless steel 300 - 380 HB ≤ 1320 AFNOR 29CNA17-07, GOST 09Ch17N7Ju1, UNI X53CrMnNiN21 ASTM A48 Grade 20 (F11401), EN-JL-100, DIN GG-10 (0.6010), SS 0110, STN 422410, BS Grade 150, UNE FG10, K1.1 ferritic or ferritic-pearlitic < 180 HB ≤ 190 GB HAT 100, AFNOR Ft10D, GOST SC 10, UNI G10 Gray iron (ASTM A48) or Automotive Gray iron (ASTM A159) ASTM A48 Grade 30 (F12101), EN-JL-1030, DIN GG-20 (0.6020), SS 0120, STN 422420, BS Grade 220, UNE FG20, K1 K1.2 (iron-carbon castings with a lamellar graphite microstructure) ferritic-pearlictic or pearlitic 180 - 240 HB > 190 ≤ 310 GB HT200, AFNOR Ft20D, GOST СЧ20, UNI G20 ASTM A48 Grade 50 (F13501), EN-JL-1060, DIN GG-35 (0.6035), SS 0135, STN 422435, BS Grade 350, UNE FG35, K1.3 pearlitic 240 - 280 HB > 310 ≤ 390 GB HAT300, AFNOR Ft35D, GOST SC35, UNI G35 ASTM A602 Grade M3210 (F20000), EN-JM-1130, DIN GTS-35 (0.8135), SS 0815, BS B340/12, UNE Type A, K2.1 ferritic < 160 HB ≤ 400 AFNOR MN 35‑10, GOST КЧ35-10 Malleable iron (ASTM A602) K2 K2.2 (iron-carbon castings with a graphite-free microstructure) ferritic or pearlitic 160 - 200 HB > 400 ≤ 550 ASTM A602 Grade M4504 (F20001), EN-JM-1040, DIN GTS-50-05 (0.8045), BS P50-05, AFNOR MB 45-7 ASTM A602 Grade M7002 (F20004), EN-JM-1140, DIN GTS-45 (0.8145), SS 0854, STN 422540, BS P 45-06, UNE Typ B, K2.3 pearlitic 200 - 240 HB > 550 ≤ 660 AFNOR MP 50-5, GOST КЧ45-7, UNI GMN 45 ASTM A536 Grade 60-40-18 (F32800), EN-JS-1030, DIN GGG-40 (0.7040), SS 0717, STN 422304, BS 420/12, K3.1 ferritic < 180 HB ≤ 560 UNE FGE 42‑12, GB QT 400, AFNOR FGS 400-12, GOST ВЧ40 K K3 K3.2 Ductile iron (ASTM A536) (iron-carbon castings with a nodular graphite microsturcture) ferritic or pearlitic 180 - 220 HB > 560 ≤ 680 ASTM A536 Grade 80-55-06 (F33800), EN-JS-1050, DIN GGG-50 (0.7050), SS 0727, STN 422305, BS 500/7, UNE FGE 50-7, GB QT 500-7, AFNOR FGS 500-7, GOST ВЧ50 ASTM A536 Grade 100-70-03 (F34800), EN-JS-1060, DIN GGG-60 (0.7060), SS 0732, STN 422306, BS 600/3, UNE FG70-2, K3.3 pearlitic 220 - 260 HB > 680 ≤ 800 GB QT 600-3, AFNOR FGS 600-3, GOST ВЧ60 Austenitic gray iron (ASTM A436) ASTM A436 Type 1 (L-NiCuCr 15 6 2, F41000), EN-JL-3011, DIN GGL-NiMn 13 7 (0.6652), SS 0523, BS Grade F1, K4.1 < 180 HB ≤ 190 (iron-carbon alloy castings with an austenitic lamellar graphite microstructure) AFNOR FGL-Ni13Mn7, GOST S-NiMn 13 7 Austenitic ductile iron (ASTM A439 or ASTM A571) ASTM A439 Type D-2B (S-NiCr 20 3, F43001), EN-JS-3021, DIN GGG-NiMn 23 4, SS 0776, BS Grade S2M, AFNOR K4.2 < 240 HB ≤ 740 K4 (iron-carbon alloy castings with an austenitic nodular graphite microstructure) FGS Ni23 Mn4, GOST ЧН19Х3Ш K4.3 < 280 HB > 840 ≤ 980 ASTM A897 Grade 110-70-11 Austempered ductile iron (ASTM A897) K4.4 280 - 320 HB > 980 ≤ 1130 ASTM A897 Grade 125-80-10, EN-JS-1100, DIN GGG-90 (5.3400) (iron-carbon alloy castings with an ausferrite microstructure) K4.5 320 - 360 HB > 1130 ≤ 1280 ASTM A897 Grade 2 (150-110-07), EN-JS-1110, DIN GGG-100 (5.3403) K5.1 ferritic < 180 HB ≤ 400 ASTM A842 Grade 300, EN-GJV-300, DIN GGV 30, GOST ЧВГ30, Compacted graphite iron CGI (ASTM A842) K5 K5.2 (iron-carbon castings with a vermicular graphite structure) ferritic-pearlitic 180 - 220 HB > 400 ≤ 450 ASTM A842 Grade 350, EN-GJV-350, DIN GGV 35 (5.2200), GOST ЧВГ30, K5.3 pearlitic 220 - 260 HB > 450 ≤ 500 ASTM A842 Grade 450, EN-GJV-450, DIN GGV 45, GOST ЧВГ45, N1.1 Commercially pure wrought aluminum < 60 HB ≤ 240 UNS A91200, EN AL99.0, DIN 3.0205, SS 4010, STN 424009, BS 1C, UNE L-3001, GB L5, AFNOR A4, GOST АДС, UNI 3567 UNS A93004, EN AlMn0.5Mg0.5, DIN 3.0505, SS 4054, STN 424432, BS N31, UNE L-3831, GB LF2, AFNOR A-M1, N1.2 half hard tempered 60 - 100 HB > 240 ≤ 400 N1 Wrought aluminum alloys GOST АМц, UNI 3568 UNS A95083, EN AlMg4.5Mn0.7, DIN 3.3547, SS 4140, STN 424415, BS N8, UNE L-3321, GB AlMg4.5Mn, N1.3 full hard tempered 100 - 150 HB > 400 ≤ 590 AFNOR A-G4.5Mn, GOST Amg 4.5, UNI P-AlMg4.4 N2.1 < 75 HB ≤ 240 UNS A02080, EN AlCu4S, BS LM11, STN 424331, UNE Al Si1Cu, GOST AMg5K, UNI G-AlSi7Mg UNS A02420, EN AlCu4Ni2Mg2, SS AlSi7MgFe, BS LM6, STN 424519, UNE Al-7SiMg, AFNOR A-S7G, GOST AK7, N2 N2.2 Cast aluminium alloys 75 - 90 HB > 240 ≤ 270 UNI G-AlSi7Mg N2.3 90 - 140 HB > 270 ≤ 440 UNS A03360, EN G-ALCu4NiMg2, SS ALSi10Mg, STN 424336, BS LM 30, AFNOR A-S10G, UNI G-AlSi9Mg N N3.1 N3.2 Free-cutting copper-alloys materials with excellent machining properties Short-chip copper-alloys with good to moderate machining properties UNS C14700, EN CuPb1P, DIN 2.1498, STN 423214, BS C111, AFNOR CuZn35Pb2, GOST L63-3, UNI CuS(P0.01) UNS C81540, EN CuNi2SiCr, DIN 2.0857, STN 423220, BS NS113, UNE CuSn12, AFNOR CuZn40, GOST L60, UNI P-CuZn-40 N3 Electrolytic copper and long-chip copper-alloys with moderate to poor N3.3 UNS C10100, EN CuAg0.1, DIN 2.1203, SS 5010, UNE CUSi3Mn1, AFNOR Cu-C2, GOST M1f, UNI Cu-OF machining properties ABS, Acryl, Duraplast, Elastomer, EP, Epoxid, FEP, Fluor, Gummi, Kautschuk, Latex, MF, MPF, PA, PAI, PC, PE, PEEK, PEI, PES, N4.1 Thermoplastic polymers PET, PF, Phenolharze, PI, PMMA, Polyamide, Polyester, Polyolefine, Polysulfon, POM, PP, PPE, PPS, PS, PSU, PTFE, PU, PUR, N4 PVDF, SAN, SI, Styrol, UF, Ureol N4.2 Thermosetting polymers Aramid, Epoxy, Fluoropolymer, Mehacrylate, Melamine, Phenolic, Polyester, Polyimide, Polymethacrylimide, Polyurethane N4.3 Reinforced polymers or composites CFK, GFK, GMT, Honeycomb, Kevlar, LFT, Organo, SMC N5 N5.1 Graphite CGM-1, CM-00, GM-10, GM-11, GR030, GR030PI, GR060, GR060PI, GR125, MC-01, MC-01RO, MC-03, MC-03M S1.1 < 200 HB ≤ 660 UNS R50250 (Grade 1), EN Ti 99.6, DIN 3.7035, BS TA.2, UNE Ti-Po2, AFNOR T-40, GOST BT1-00 S1 S1.2 Titanium or titanium alloys 200 - 280 HB > 660 ≤ 950 UNS R56404 (Grade 29), EN Ti2Cu, DIN 3.7124, BS TA.21, UNE Ti-P11, AFNOR T-U2 S1.3 280 - 360 HB > 950 ≤ 1200 UNS R54250 (Grade 38), EN TiAl6V4, DIN 3.7165, ČSN TiAl6VELI, BS TA. 13, UNE Ti-P63, AFNOR T-A6V, GOST BT6 S2.1 < 200 HB ≤ 690 UNS N08801 (Incoloy 801), EN X8 NiCrAlTi31-21, DIN 1.4959, BS NA 15, AFNOR Z8NC33-21 S2 S2.2 Fe-based high-temperature alloys 200 - 280 HB > 690 ≤ 970 UNS N19907, EN X6NiCrTiMoVB25-15-2, DIN 1.4980, SS 2570, BS HR52, AFNOR Z6NCTDV25.15B, GOST 36НХТЮ S S3.1 < 280 HB ≤ 940 UNS A09706 (Inconel 706), EN NiCr25FeAl, DIN 2.4856, BS HR 6, ČSN Inconel 625, UNE F.3313, GB 1Cr16Ni35, S3 Ni-based high-temperature alloys AFNOR NC22FeDNB, GOST XH38BT S3.2 280 - 360 HB > 940 ≤ 1200 UNS N07001, EN NiCr20Co13Mo4Ti3Al, DIN 2.4654, BS HR 2, ČSN Waspaloy, AFNOR NCKD 20ATV, GOST ХН80ТБЮ S4.1 < 240 HB ≤ 800 UNS R30016 (Stellite 6b), EN CoCr20W15Ni, DIN 2.4964, AFNOR KC 20 WN, GOST ЛК52 S4 S4.2 Co-based high-temperature alloys 240 - 320 HB > 800 ≤ 1070 UNS R30016 (Stellite 6b), EN CoCr20W15Ni, DIN 2.4964, AFNOR KC 20 WN, GOST ЛК52 H1 H1.1 Chilled cast iron < 440 HB UNS F45001, EN-GJS-1050-6, DIN 5.3406, SS 0512, BS Grade 2A H2.1 < 55 HRC UNS F45003, EN-GJS-1400-1, DIN 5.3405, SS 0457, BS Grade 3D H2 H2.2 Hardended cast iron > 55 HRC UNS F45003, EN G-X260NiCr4-2, DIN 0.9620, SS 0466, BS Grade S AISI 4135, EN 34CrMo4, DIN 1.7220, SS 2234, STN 415131, BS 198, UNE F.1250, GB 35CrMo, AFNOR 35CD4, H3.1 < 51 HRC GOST АС38ХГМ, UNI 35CrMo4KB H H3 H3.2 Hardened steel <55HRC 51 - 55 HRC AISI 4135, EN 34CrMo4, DIN 1.7220, SS 2234, STN 415131, BS 198, UNE F.1250, GB 35CrMo, AFNOR 35CD4, GOST АС38ХГМ, UNI 35CrMo4KB UNS T31501, EN 100MnCrW4, DIN 1.2510, SS 2140, STN 419413, BS BO1, UNE F.5220, GB 9CrWMn, AFNOR 90MWCrV5, H4.1 55 - 59 HRC GOST 9ХВГ, UNI 95MNWCr5KU H4 Hardened steel >55HRC UNS T31501, EN 100MnCrW4, DIN 1.2510, SS 2140, STN 419413, BS BO1, UNE F.5220, GB 9CrWMn, AFNOR 90MWCrV5, H4.2 > 59 HRC GOST 9ХВГ, UNI 95MNWCr5KU 2